Add av_display_rotation_hflip_get to get information whether the
matrix indicates horizontal flip.
---
doc/APIchanges | 3 +++
libavutil/display.c | 14 ++++++++++++++
libavutil/display.h | 14 ++++++++++++++
libavutil/tests/display.c | 8 ++++++++
libavutil/version.h | 2 +-
tests/ref/fate/display | 4 ++++
6 files changed, 44 insertions(+), 1 deletion(-)
diff --git a/doc/APIchanges b/doc/APIchanges
index e75c4044ce..73c6809563 100644
--- a/doc/APIchanges
+++ b/doc/APIchanges
@@ -15,6 +15,9 @@ libavutil: 2017-10-21
API changes, most recent first:
+2019-05-13 - XXXXXXXXXX - lavu 56.28.100 - display.h
+ Add av_display_rotation_hflip_get
+
2019-04-20 - 3153a6502a - lavc 58.52.100 - avcodec.h
Add AV_CODEC_FLAG_DROPCHANGED to allow avcodec_receive_frame to drop
frames whose parameters differ from first decoded frame in stream.
diff --git a/libavutil/display.c b/libavutil/display.c
index a0076e067b..f5a6a4a08d 100644
--- a/libavutil/display.c
+++ b/libavutil/display.c
@@ -71,3 +71,17 @@ void av_display_matrix_flip(int32_t matrix[9], int hflip,
int vflip)
for (i = 0; i < 9; i++)
matrix[i] *= flip[i % 3];
}
+
+double av_display_rotation_hflip_get(const int32_t matrix[9], int *hflip)
+{
+ int32_t m[9];
+ *hflip = 0;
+ memcpy(m, matrix, sizeof(m));
+
+ if (m[0] > 0 && m[4] < 0 || m[0] < 0 && m[4] > 0 ||
+ m[1] > 0 && m[3] > 0 || m[1] < 0 && m[3] < 0) {
+ *hflip = 1;
+ av_display_matrix_flip(m, 1, 0);
+ }
+ return av_display_rotation_get(m);
+}
diff --git a/libavutil/display.h b/libavutil/display.h
index 515adad795..c37d10c741 100644
--- a/libavutil/display.h
+++ b/libavutil/display.h
@@ -106,6 +106,20 @@ void av_display_rotation_set(int32_t matrix[9], double
angle);
*/
void av_display_matrix_flip(int32_t matrix[9], int hflip, int vflip);
+/**
+ * Extract the rotation component and hflip status of the transformation
matrix.
+ *
+ * @param matrix the transformation matrix
+ * @param hflip will be set to 1 if the matrix indicates horizontal flip
+ * @return the angle (in degrees) by which the transformation rotates the frame
+ * counterclockwise. The angle will be in range [-180.0, 180.0],
+ * or NaN if the matrix is singular.
+ *
+ * @note floating point numbers are inherently inexact, so callers are
+ * recommended to round the return value to nearest integer before use.
+ */
+double av_display_rotation_hflip_get(const int32_t matrix[9], int* hflip);
+
/**
* @}
* @}
diff --git a/libavutil/tests/display.c b/libavutil/tests/display.c
index 893ebb5543..65a0971e7b 100644
--- a/libavutil/tests/display.c
+++ b/libavutil/tests/display.c
@@ -35,6 +35,8 @@ static void print_matrix(int32_t matrix[9])
int main(void)
{
int32_t matrix[9];
+ int hflip = 0;
+ double degree;
// Set the matrix to 90 degrees
av_display_rotation_set(matrix, 90);
@@ -56,6 +58,12 @@ int main(void)
print_matrix(matrix);
printf("degrees: %f\n", av_display_rotation_get(matrix));
+ // flip vertical
+ av_display_matrix_flip(matrix, 0, 1);
+ print_matrix(matrix);
+ degree = av_display_rotation_hflip_get(matrix, &hflip);
+ printf("degrees: %f, hflip: %i\n", degree, hflip);
+
return 0;
}
diff --git a/libavutil/version.h b/libavutil/version.h
index 12b4f9fc3a..91ab71604b 100644
--- a/libavutil/version.h
+++ b/libavutil/version.h
@@ -79,7 +79,7 @@
*/
#define LIBAVUTIL_VERSION_MAJOR 56
-#define LIBAVUTIL_VERSION_MINOR 27
+#define LIBAVUTIL_VERSION_MINOR 28
#define LIBAVUTIL_VERSION_MICRO 100
#define LIBAVUTIL_VERSION_INT AV_VERSION_INT(LIBAVUTIL_VERSION_MAJOR, \
diff --git a/tests/ref/fate/display b/tests/ref/fate/display
index 251e7e0cdf..14b4c7db7c 100644
--- a/tests/ref/fate/display
+++ b/tests/ref/fate/display
@@ -14,3 +14,7 @@ degrees: 135.000000
-46340 -46340 0
0 0 1073741824
degrees: -135.000000
+-46340 -46340 0
+-46340 46340 0
+0 0 1073741824
+degrees: 45.000000, hflip: 1
--
2.17.1
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